lift-app/lib/widgets/update_dialog.dart

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flustars/flustars.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:liftmanager/res/resources.dart';
import 'package:liftmanager/routers/fluro_navigator.dart';
import 'package:liftmanager/utils/theme_utils.dart';
import 'package:liftmanager/utils/toast.dart';
import 'package:liftmanager/utils/version_utils.dart';

class UpdateDialog extends StatefulWidget {

  UpdateDialog({this.content,this.version,this.url,this.code,this.forceUpdate});
  final String content;
  final int code;
  final String version;
  final String url;
  final bool forceUpdate;
  @override
  _UpdateDialogState createState() => _UpdateDialogState();
}

class _UpdateDialogState extends State<UpdateDialog> {

  CancelToken _cancelToken = CancelToken();
  bool _isDownload = false;
  double _value = 0;

  @override
  void dispose() {
    if (!_cancelToken.isCancelled && _value != 1){
      _cancelToken.cancel();
    }
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    Color primaryColor = Theme.of(context).primaryColor;
    return WillPopScope(
      onWillPop: () async{
        /// 使用false禁止返回键返回，达到强制升级目的
        return !widget.forceUpdate;
      },
      child: Scaffold(
          resizeToAvoidBottomInset: false,
          backgroundColor: Colors.transparent,
          body: Center(
            child: Container(
                decoration: BoxDecoration(
                  color: ThemeUtils.getDialogBackgroundColor(context),
                  borderRadius: BorderRadius.circular(8.0),
                ),
                width: 280.0,
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: <Widget>[
                     Padding(
                      padding: EdgeInsets.only(left: 15.0, right: 15.0, top: 16.0),
                      child: Text("新版本更新 ${widget.version}", style: TextStyles.textSize16),
                    ),
                    Padding(
                      padding: const EdgeInsets.symmetric(horizontal: 15.0, vertical: 10.0),
                      child: Text("${widget.content}"),
                    ),
                    Padding(
                      padding: const EdgeInsets.only(bottom: 15.0, left: 15.0, right: 15.0 , top: 5.0),
                      child: _isDownload ? LinearProgressIndicator(
                        backgroundColor: Colours.line,
                        valueColor: new AlwaysStoppedAnimation<Color>(primaryColor),
                        value: _value,
                      ): Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: <Widget>[
                          Offstage(
                            offstage:widget.forceUpdate,
                            child: Container(
                              width: 110.0,
                              height: 36.0,
                              child: FlatButton(
                                onPressed: (){
                                  SpUtil.putInt("version_code",widget.code);
                                  NavigatorUtils.goBack(context);
                                },
                                textColor: primaryColor,
                                color: Colors.transparent,
                                disabledTextColor: Colors.white,
                                disabledColor: Colours.text_gray_c,
                                shape: RoundedRectangleBorder(
                                    borderRadius: BorderRadius.circular(18.0),
                                    side: BorderSide(
                                      color: primaryColor,
                                      width: 0.8,
                                    )
                                ),
                                child: Text(
                                  "残忍拒绝",
                                  style: TextStyle(fontSize: Dimens.font_sp16),
                                ),
                              ),
                            )
                          ),
                          Container(
                            width: 110.0,
                            height: 36.0,
                            child: FlatButton(
                              onPressed: (){
                                if (defaultTargetPlatform == TargetPlatform.iOS){
                                  NavigatorUtils.goBack(context);
                                  VersionUtils.jumpAppStore();
                                }else{
                                  setState(() {
                                    _isDownload = true;
                                  });
                                  _download();
                                }
                              },
                              textColor: Colors.white,
                              color: primaryColor,
                              disabledTextColor: Colors.white,
                              disabledColor: Colours.text_gray_c,
                              shape: RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(18.0),
                              ),
                              child: Text(
                                "立即更新",
                                style: TextStyle(fontSize: Dimens.font_sp16),
                              ),
                            ),
                          )
                        ],
                      ),
                    )
                  ],
                )
            ),
          )
      ),
    );
  }

  ///下载apk
  _download() async {
    try {
      await DirectoryUtil.getInstance();
      DirectoryUtil.createStorageDirSync(category: 'apk');
      String path = DirectoryUtil.getStoragePath(fileName: 'liftmanager-${widget.version}', category: 'apk', format: 'apk');
      File file = File(path);
      /// 链接可能会失效
      await Dio().download("${widget.url}",
        file.path,
        cancelToken: _cancelToken,
        onReceiveProgress: (int count, int total){
          if (total != -1) {
            _value = count / total;
            setState(() {

            });
            if (count == total){
              NavigatorUtils.goBack(context);
              print("path:::");
              print(path);
              VersionUtils.install(path);
            }
          }
        },
      );
    }catch (e){
      toasts("下载失败");
      print(e);
      setState(() {
        _isDownload = false;
      });
    }
  }
}